Lobbying is great, you, yourself can talk to your local representative. If lobbying is removed, then you can't legally talk to your local representative. Which means those with a lot of money can afford to illegally 'lobby'.
The problem is why are USA politicians so easy to sway with lobbying? Is it voters? Is it the two-party system? Is it that easy to get re-elected?
The ease of sway with lobbying is a symptom of something deeper and systemic. IMO, I think it's the two party system (One party away from China!). If you disagree, who's the third most popular party in USA? Europe and many other countries have a sizable third most popular party(!).